-3(1-7r)=186

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Solution for -3(1-7r)=186 equation: 


Simplifying
-3(1 + -7r) = 186
(1 * -3 + -7r * -3) = 186
(-3 + 21r) = 186

Solving
-3 + 21r = 186

Solving for variable 'r'.

Move all terms containing r to the left, all other terms to the right.

Add '3' to each side of the equation.
-3 + 3 + 21r = 186 + 3

Combine like terms: -3 + 3 = 0
0 + 21r = 186 + 3
21r = 186 + 3

Combine like terms: 186 + 3 = 189
21r = 189

Divide each side by '21'.
r = 9

Simplifying
r = 9

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